How to manually trigger or inhibit periodic OCT updates in Arria 10

[SLabe]

As mentioned in A10 EMIF UG, looking for information on the following statement:

"Contact Intel FPGA Technical Services for information on how to manually trigger or inhibit periodic OCT updates for applications that are sensitive to latency."

Please share the solution so I can enable my customer. Thank you,

[yoichiK_intel]

Hi 

You can change the periodic OCT option in the EMIF IP GUI parameter. 

[SLabe]

Hi, the GUI only lets permanently enable or disable Periodic OCT Calibration. What we need is the ability to selectively block it during critical data transfers and then re-enable it the rest of the time to compensate for temperature cycling, etc ...

According to 3.4.3:  https://www.intel.com/content/www/us/en/programmable/documentation/eqw1503946000045.html#mhi14605679... there is a way to do this, but requires your support. My local Intel resource indicated some lower level code may need changing to expose the appropriate controls.

Thank you,

[yoichiK_intel]

Hi

There is file to control the periodic OCT update and you can tweak the oct_recal_req signal in the file to enable or disable the periodic OCT.

ip/ed_synth/ed_synth_emif_0/altera_emif_arch_nf_191/synth/altera_emif_arch_nf_oct.sv